Switching Angle Control for Power Converter EMI Mitigation
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Solution Overview
Problem
Existing EMI mitigation techniques in power electronics and power converters face challenges in reducing electromagnetic interference (EMI) noise effectively, particularly in high-frequency applications, leading to wasted energy and degraded system performance, with hardware solutions being bulky and costly, and software/modulation techniques having limitations in noise reduction and performance degradation.
Innovation Solution
A software/modulation technique that adjusts switching angles to disperse harmonic energy into non-EMI frequency ranges, using a modulation block to control duty cycles and DC voltage levels, and employing artificial neural networks for real-time control, without adding passive components, thereby reducing both common-mode and differential-mode noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hardware solutions (filters, shields) are used to reduce EMI noise, then EMI noise reduction is achieved, but device complexity and cost increase
Solution Approach 1:
The patent replaces hardware-based EMI mitigation (mechanical/electrical filters and shields) with a software/modulation technique that adjusts switching angles. This substitutes physical components with a control algorithm that disperses harmonic energy into non-EMI frequency ranges, reducing common-mode and differential-mode noise without adding passive components.
Solution Approach 2:
The patent changes the switching angles parameter of the power electronic device to alter the frequency distribution of harmonic energy. By modifying this operational parameter, the system disperses EMI energy into frequency ranges that do not interfere with operational bands, achieving noise reduction without hardware modifications.
2Object-affected harmful factors
If hardware solutions (filters, shields) are used to reduce EMI noise, then EMI noise reduction is achieved, but cost increases
Solution Approach 1:
The patent replaces expensive hardware EMI mitigation components (filters, shields) with a software-based modulation technique. This substitution eliminates the need for additional passive components, reducing material costs and simplifying manufacturing while maintaining effective EMI noise reduction.
Solution Approach 2:
The patent uses a computational approach (switching angle adjustment) that is inexpensive compared to hardware solutions. The software/modulation technique requires no physical components, making it cost-effective and easy to implement across different power electronic systems.
3Productivity
If switching frequency is increased to improve device performance, then device performance is improved, but EMI noise increases
Solution Approach 1:
The patent changes the frequency distribution parameter of harmonic energy by adjusting switching angles. This transforms the EMI spectrum so that energy is dispersed into frequency ranges that do not overlap with operational bands, allowing high switching frequencies to be used for improved device performance without generating harmful EMI noise.
Solution Approach 2:
The patent addresses the EMI problem by moving to a different dimension - instead of reducing switching frequency (time domain), it disperses energy across the frequency spectrum (frequency domain). This dimensional shift allows high-frequency operation while avoiding EMI interference through spectral distribution control.
Data Source
AI summary
Various examples related to electromagnetic interference (EMI) energy mitigation techniques are provided. In one example, a method includes determining electromagnetic interference (EMI) spectrum information based upon switching angles of a switching circuit and processing harmonic magnitudes (Ci) associated with the switching angles using an artificial neural network to determine adjusted switching angles for the switching circuit; and applying the adjusted switching angles to control the switching circuit thereby reducing generated EMI energy by the switching circuit.